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https://gitee.com/mybatis-flex/mybatis-flex.git
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feat: add sqlServer 2005 LimitOffsetProcessor
This commit is contained in:
开源海哥
parent
81016ec601
commit
9582f88cf7
@ -58,6 +58,10 @@ public enum DbType {
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* SQLSERVER
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*/
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SQLSERVER("sqlserver", "SQLServer 数据库"),
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/**
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* SqlServer 2005 数据库
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*/
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SQLSERVER_2005("sqlserver_2005", "SQLServer 数据库"),
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/**
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* DM
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*/
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@ -31,148 +31,151 @@ import java.util.regex.Pattern;
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*/
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public class DbTypeUtil {
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private DbTypeUtil() {}
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private DbTypeUtil() {
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}
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/**
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* 获取当前配置的 DbType
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*/
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public static DbType getDbType(DataSource dataSource) {
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String jdbcUrl = getJdbcUrl(dataSource);
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/**
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* 获取当前配置的 DbType
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*/
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public static DbType getDbType(DataSource dataSource) {
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String jdbcUrl = getJdbcUrl(dataSource);
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if (StringUtil.isNotBlank(jdbcUrl)) {
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return parseDbType(jdbcUrl);
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}
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if (StringUtil.isNotBlank(jdbcUrl)) {
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return parseDbType(jdbcUrl);
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}
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throw new IllegalStateException("Can not get dataSource jdbcUrl: " + dataSource.getClass().getName());
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}
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throw new IllegalStateException("Can not get dataSource jdbcUrl: " + dataSource.getClass().getName());
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}
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/**
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* 通过数据源中获取 jdbc 的 url 配置
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* 符合 HikariCP, druid, c3p0, DBCP, beecp 数据源框架 以及 MyBatis UnpooledDataSource 的获取规则
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* UnpooledDataSource 参考 @{@link UnpooledDataSource#getUrl()}
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*
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* @return jdbc url 配置
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*/
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public static String getJdbcUrl(DataSource dataSource) {
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String[] methodNames = new String[]{"getUrl", "getJdbcUrl"};
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for (String methodName : methodNames) {
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try {
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Method method = dataSource.getClass().getMethod(methodName);
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return (String) method.invoke(dataSource);
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} catch (Exception e) {
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//ignore
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}
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}
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/**
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* 通过数据源中获取 jdbc 的 url 配置
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* 符合 HikariCP, druid, c3p0, DBCP, beecp 数据源框架 以及 MyBatis UnpooledDataSource 的获取规则
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* UnpooledDataSource 参考 @{@link UnpooledDataSource#getUrl()}
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*
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* @return jdbc url 配置
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*/
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public static String getJdbcUrl(DataSource dataSource) {
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String[] methodNames = new String[]{"getUrl", "getJdbcUrl"};
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for (String methodName : methodNames) {
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try {
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Method method = dataSource.getClass().getMethod(methodName);
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return (String) method.invoke(dataSource);
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} catch (Exception e) {
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//ignore
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}
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}
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Connection connection = null;
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try {
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connection = dataSource.getConnection();
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return connection.getMetaData().getURL();
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} catch (Exception e) {
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throw FlexExceptions.wrap("Can not get the dataSource jdbcUrl", e);
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} finally {
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if (connection != null) {
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try {
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connection.close();
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} catch (SQLException e) { //ignore
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}
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}
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}
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}
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Connection connection = null;
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try {
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connection = dataSource.getConnection();
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return connection.getMetaData().getURL();
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} catch (Exception e) {
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throw FlexExceptions.wrap("Can not get the dataSource jdbcUrl", e);
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} finally {
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if (connection != null) {
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try {
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connection.close();
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} catch (SQLException e) { //ignore
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}
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}
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}
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}
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/**
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* 参考 druid 和 MyBatis-plus 的 JdbcUtils
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* {@link com.alibaba.druid.util.JdbcUtils#getDbType(String, String)}
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* {@link com.baomidou.mybatisplus.extension.toolkit.JdbcUtils#getDbType(String)}
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*
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* @param jdbcUrl jdbcURL
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* @return 返回数据库类型
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*/
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public static DbType parseDbType(String jdbcUrl) {
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jdbcUrl = jdbcUrl.toLowerCase();
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if (jdbcUrl.contains(":mysql:") || jdbcUrl.contains(":cobar:")) {
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return DbType.MYSQL;
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} else if (jdbcUrl.contains(":mariadb:")) {
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return DbType.MARIADB;
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} else if (jdbcUrl.contains(":oracle:")) {
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return DbType.ORACLE;
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} else if (jdbcUrl.contains(":sqlserver:") || jdbcUrl.contains(":microsoft:") || jdbcUrl.contains(":sqlserver2012:")) {
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return DbType.SQLSERVER;
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} else if (jdbcUrl.contains(":postgresql:")) {
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return DbType.POSTGRE_SQL;
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} else if (jdbcUrl.contains(":hsqldb:")) {
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return DbType.HSQL;
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} else if (jdbcUrl.contains(":db2:")) {
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return DbType.DB2;
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} else if (jdbcUrl.contains(":sqlite:")) {
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return DbType.SQLITE;
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} else if (jdbcUrl.contains(":h2:")) {
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return DbType.H2;
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} else if (isMatchedRegex(":dm\\d*:", jdbcUrl)) {
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return DbType.DM;
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} else if (jdbcUrl.contains(":xugu:")) {
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return DbType.XUGU;
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} else if (isMatchedRegex(":kingbase\\d*:", jdbcUrl)) {
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return DbType.KINGBASE_ES;
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} else if (jdbcUrl.contains(":phoenix:")) {
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return DbType.PHOENIX;
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} else if (jdbcUrl.contains(":zenith:")) {
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return DbType.GAUSS;
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} else if (jdbcUrl.contains(":gbase:")) {
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return DbType.GBASE;
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} else if (jdbcUrl.contains(":gbasedbt-sqli:") || jdbcUrl.contains(":informix-sqli:")) {
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return DbType.GBASE_8S;
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} else if (jdbcUrl.contains(":ch:") || jdbcUrl.contains(":clickhouse:")) {
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return DbType.CLICK_HOUSE;
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} else if (jdbcUrl.contains(":oscar:")) {
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return DbType.OSCAR;
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} else if (jdbcUrl.contains(":sybase:")) {
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return DbType.SYBASE;
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} else if (jdbcUrl.contains(":oceanbase:")) {
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return DbType.OCEAN_BASE;
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} else if (jdbcUrl.contains(":highgo:")) {
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return DbType.HIGH_GO;
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} else if (jdbcUrl.contains(":cubrid:")) {
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return DbType.CUBRID;
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} else if (jdbcUrl.contains(":goldilocks:")) {
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return DbType.GOLDILOCKS;
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} else if (jdbcUrl.contains(":csiidb:")) {
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return DbType.CSIIDB;
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} else if (jdbcUrl.contains(":sap:")) {
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return DbType.SAP_HANA;
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} else if (jdbcUrl.contains(":impala:")) {
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return DbType.IMPALA;
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} else if (jdbcUrl.contains(":vertica:")) {
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return DbType.VERTICA;
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} else if (jdbcUrl.contains(":xcloud:")) {
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return DbType.XCloud;
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} else if (jdbcUrl.contains(":firebirdsql:")) {
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return DbType.FIREBIRD;
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} else if (jdbcUrl.contains(":redshift:")) {
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return DbType.REDSHIFT;
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} else if (jdbcUrl.contains(":opengauss:")) {
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return DbType.OPENGAUSS;
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} else if (jdbcUrl.contains(":taos:") || jdbcUrl.contains(":taos-rs:")) {
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return DbType.TDENGINE;
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} else if (jdbcUrl.contains(":informix")) {
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return DbType.INFORMIX;
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} else if (jdbcUrl.contains(":uxdb:")) {
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return DbType.UXDB;
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} else if (jdbcUrl.contains(":greenplum:")) {
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return DbType.GREENPLUM;
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} else {
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return DbType.OTHER;
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}
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}
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/**
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* 参考 druid 和 MyBatis-plus 的 JdbcUtils
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* {@link com.alibaba.druid.util.JdbcUtils#getDbType(String, String)}
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* {@link com.baomidou.mybatisplus.extension.toolkit.JdbcUtils#getDbType(String)}
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*
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* @param jdbcUrl jdbcURL
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* @return 返回数据库类型
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*/
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public static DbType parseDbType(String jdbcUrl) {
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jdbcUrl = jdbcUrl.toLowerCase();
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if (jdbcUrl.contains(":mysql:") || jdbcUrl.contains(":cobar:")) {
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return DbType.MYSQL;
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} else if (jdbcUrl.contains(":mariadb:")) {
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return DbType.MARIADB;
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} else if (jdbcUrl.contains(":oracle:")) {
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return DbType.ORACLE;
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} else if (jdbcUrl.contains(":sqlserver2012:")) {
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return DbType.SQLSERVER;
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} else if (jdbcUrl.contains(":sqlserver:") || jdbcUrl.contains(":microsoft:")) {
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return DbType.SQLSERVER_2005;
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} else if (jdbcUrl.contains(":postgresql:")) {
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return DbType.POSTGRE_SQL;
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} else if (jdbcUrl.contains(":hsqldb:")) {
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return DbType.HSQL;
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} else if (jdbcUrl.contains(":db2:")) {
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return DbType.DB2;
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} else if (jdbcUrl.contains(":sqlite:")) {
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return DbType.SQLITE;
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} else if (jdbcUrl.contains(":h2:")) {
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return DbType.H2;
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} else if (isMatchedRegex(":dm\\d*:", jdbcUrl)) {
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return DbType.DM;
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} else if (jdbcUrl.contains(":xugu:")) {
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return DbType.XUGU;
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} else if (isMatchedRegex(":kingbase\\d*:", jdbcUrl)) {
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return DbType.KINGBASE_ES;
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} else if (jdbcUrl.contains(":phoenix:")) {
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return DbType.PHOENIX;
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} else if (jdbcUrl.contains(":zenith:")) {
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return DbType.GAUSS;
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} else if (jdbcUrl.contains(":gbase:")) {
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return DbType.GBASE;
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} else if (jdbcUrl.contains(":gbasedbt-sqli:") || jdbcUrl.contains(":informix-sqli:")) {
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return DbType.GBASE_8S;
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} else if (jdbcUrl.contains(":ch:") || jdbcUrl.contains(":clickhouse:")) {
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return DbType.CLICK_HOUSE;
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} else if (jdbcUrl.contains(":oscar:")) {
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return DbType.OSCAR;
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} else if (jdbcUrl.contains(":sybase:")) {
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return DbType.SYBASE;
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} else if (jdbcUrl.contains(":oceanbase:")) {
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return DbType.OCEAN_BASE;
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} else if (jdbcUrl.contains(":highgo:")) {
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return DbType.HIGH_GO;
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} else if (jdbcUrl.contains(":cubrid:")) {
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return DbType.CUBRID;
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} else if (jdbcUrl.contains(":goldilocks:")) {
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return DbType.GOLDILOCKS;
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} else if (jdbcUrl.contains(":csiidb:")) {
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return DbType.CSIIDB;
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} else if (jdbcUrl.contains(":sap:")) {
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return DbType.SAP_HANA;
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} else if (jdbcUrl.contains(":impala:")) {
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return DbType.IMPALA;
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} else if (jdbcUrl.contains(":vertica:")) {
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return DbType.VERTICA;
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} else if (jdbcUrl.contains(":xcloud:")) {
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return DbType.XCloud;
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} else if (jdbcUrl.contains(":firebirdsql:")) {
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return DbType.FIREBIRD;
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} else if (jdbcUrl.contains(":redshift:")) {
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return DbType.REDSHIFT;
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} else if (jdbcUrl.contains(":opengauss:")) {
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return DbType.OPENGAUSS;
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} else if (jdbcUrl.contains(":taos:") || jdbcUrl.contains(":taos-rs:")) {
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return DbType.TDENGINE;
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} else if (jdbcUrl.contains(":informix")) {
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return DbType.INFORMIX;
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} else if (jdbcUrl.contains(":uxdb:")) {
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return DbType.UXDB;
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} else if (jdbcUrl.contains(":greenplum:")) {
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return DbType.GREENPLUM;
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} else {
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return DbType.OTHER;
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}
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}
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/**
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* 正则匹配，验证成功返回 true，验证失败返回 false
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*/
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public static boolean isMatchedRegex(String regex, String jdbcUrl) {
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if (null == jdbcUrl) {
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return false;
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}
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return Pattern.compile(regex).matcher(jdbcUrl).find();
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}
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/**
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* 正则匹配，验证成功返回 true，验证失败返回 false
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*/
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public static boolean isMatchedRegex(String regex, String jdbcUrl) {
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if (null == jdbcUrl) {
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return false;
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}
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return Pattern.compile(regex).matcher(jdbcUrl).find();
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}
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}
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@ -134,6 +134,8 @@ public class DialectFactory {
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return new CommonsDialectImpl(KeywordWrap.DOUBLE_QUOTATION, LimitOffsetProcessor.DERBY);
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case SQLSERVER:
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return new CommonsDialectImpl(KeywordWrap.SQUARE_BRACKETS, LimitOffsetProcessor.SQLSERVER);
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case SQLSERVER_2005:
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return new CommonsDialectImpl(KeywordWrap.SQUARE_BRACKETS, LimitOffsetProcessor.SQLSERVER_2005);
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case INFORMIX:
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return new CommonsDialectImpl(KeywordWrap.DOUBLE_QUOTATION, LimitOffsetProcessor.INFORMIX);
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case SYBASE:
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@ -29,136 +29,152 @@ import static com.mybatisflex.core.constant.SqlConsts.*;
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*/
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public interface LimitOffsetProcessor {
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/**
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* MySql 的处理器
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* 适合 {@link DbType#MYSQL,DbType#MARIADB,DbType#H2,DbType#CLICK_HOUSE,DbType#XCloud}
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*/
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LimitOffsetProcessor MYSQL = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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sql.append(LIMIT).append(limitOffset).append(DELIMITER).append(limitRows);
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} else if (limitRows != null) {
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sql.append(LIMIT).append(limitRows);
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}
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return sql;
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};
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/**
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* MySql 的处理器
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* 适合 {@link DbType#MYSQL,DbType#MARIADB,DbType#H2,DbType#CLICK_HOUSE,DbType#XCloud}
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*/
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LimitOffsetProcessor MYSQL = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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sql.append(LIMIT).append(limitOffset).append(DELIMITER).append(limitRows);
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} else if (limitRows != null) {
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sql.append(LIMIT).append(limitRows);
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}
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return sql;
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};
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/**
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* Postgresql 的处理器
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* 适合 {@link DbType#POSTGRE_SQL,DbType#SQLITE,DbType#H2,DbType#HSQL,DbType#KINGBASE_ES,DbType#PHOENIX}
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* 适合 {@link DbType#SAP_HANA,DbType#IMPALA,DbType#HIGH_GO,DbType#VERTICA,DbType#REDSHIFT}
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* 适合 {@link DbType#OPENGAUSS,DbType#TDENGINE,DbType#UXDB}
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*/
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LimitOffsetProcessor POSTGRESQL = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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sql.append(LIMIT).append(limitRows).append(OFFSET).append(limitOffset);
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} else if (limitRows != null) {
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sql.append(LIMIT).append(limitRows);
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}
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return sql;
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};
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/**
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* Postgresql 的处理器
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* 适合 {@link DbType#POSTGRE_SQL,DbType#SQLITE,DbType#H2,DbType#HSQL,DbType#KINGBASE_ES,DbType#PHOENIX}
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* 适合 {@link DbType#SAP_HANA,DbType#IMPALA,DbType#HIGH_GO,DbType#VERTICA,DbType#REDSHIFT}
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* 适合 {@link DbType#OPENGAUSS,DbType#TDENGINE,DbType#UXDB}
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*/
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LimitOffsetProcessor POSTGRESQL = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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sql.append(LIMIT).append(limitRows).append(OFFSET).append(limitOffset);
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} else if (limitRows != null) {
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sql.append(LIMIT).append(limitRows);
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}
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return sql;
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};
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/**
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* derby 的处理器
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* 适合 {@link DbType#DERBY,DbType#ORACLE_12C,DbType#SQLSERVER ,DbType#POSTGRE_SQL}
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*/
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LimitOffsetProcessor DERBY = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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// OFFSET ** ROWS FETCH NEXT ** ROWS ONLY")
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sql.append(OFFSET).append(limitOffset).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
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} else if (limitRows != null) {
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sql.append(OFFSET).append(0).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
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}
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return sql;
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};
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/**
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* derby 的处理器
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* 适合 {@link DbType#DERBY,DbType#ORACLE_12C,DbType#SQLSERVER ,DbType#POSTGRE_SQL}
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*/
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LimitOffsetProcessor DERBY = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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// OFFSET ** ROWS FETCH NEXT ** ROWS ONLY")
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sql.append(OFFSET).append(limitOffset).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
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} else if (limitRows != null) {
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sql.append(OFFSET).append(0).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
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}
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return sql;
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};
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/**
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* derby 的处理器
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* 适合 {@link DbType#DERBY,DbType#ORACLE_12C,DbType#SQLSERVER ,DbType#POSTGRE_SQL}
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*/
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LimitOffsetProcessor SQLSERVER = (sql, queryWrapper, limitRows, limitOffset) -> {
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if (limitRows != null && limitOffset != null) {
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// OFFSET ** ROWS FETCH NEXT ** ROWS ONLY")
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sql.append(OFFSET).append(limitOffset).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
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} else if (limitRows != null) {
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List<QueryOrderBy> orderBys = CPI.getOrderBys(queryWrapper);
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if (CollectionUtil.isNotEmpty(orderBys)) {
|
||||
sql.append(OFFSET).append(0).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
|
||||
} else {
|
||||
sql.insert(6, TOP + limitRows);
|
||||
}
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
/**
|
||||
* derby 的处理器
|
||||
* 适合 {@link DbType#DERBY,DbType#ORACLE_12C,DbType#SQLSERVER ,DbType#POSTGRE_SQL}
|
||||
*/
|
||||
LimitOffsetProcessor SQLSERVER = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
// OFFSET ** ROWS FETCH NEXT ** ROWS ONLY")
|
||||
sql.append(OFFSET).append(limitOffset).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
|
||||
} else if (limitRows != null) {
|
||||
List<QueryOrderBy> orderBys = CPI.getOrderBys(queryWrapper);
|
||||
if (CollectionUtil.isNotEmpty(orderBys)) {
|
||||
sql.append(OFFSET).append(0).append(ROWS_FETCH_NEXT).append(limitRows).append(ROWS_ONLY);
|
||||
} else {
|
||||
sql.insert(6, TOP + limitRows);
|
||||
}
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Informix 的处理器
|
||||
* 适合 {@link DbType#INFORMIX}
|
||||
* 文档 {@link <a href="https://www.ibm.com/docs/en/informix-servers/14.10?topic=clause-restricting-return-values-skip-limit-first-options">https://www.ibm.com/docs/en/informix-servers/14.10?topic=clause-restricting-return-values-skip-limit-first-options</a>}
|
||||
*/
|
||||
LimitOffsetProcessor INFORMIX = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
// SELECT SKIP 2 FIRST 1 * FROM
|
||||
sql.insert(6, SKIP + limitOffset + FIRST + limitRows);
|
||||
} else if (limitRows != null) {
|
||||
sql.insert(6, FIRST + limitRows);
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
/**
|
||||
* Firebird 的处理器
|
||||
* 适合 {@link DbType#FIREBIRD}
|
||||
*/
|
||||
LimitOffsetProcessor FIREBIRD = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
// ROWS 2 TO 3
|
||||
sql.append(ROWS).append(limitOffset).append(TO).append(limitOffset + limitRows);
|
||||
} else if (limitRows != null) {
|
||||
sql.insert(6, FIRST + limitRows);
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
/**
|
||||
* Oracle11g及以下数据库的处理器
|
||||
* 适合 {@link DbType#ORACLE,DbType#DM,DbType#GAUSS}
|
||||
*/
|
||||
LimitOffsetProcessor ORACLE = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null) {
|
||||
if (limitOffset == null) {
|
||||
limitOffset = 0;
|
||||
}
|
||||
StringBuilder newSql = new StringBuilder("SELECT * FROM (SELECT TEMP_DATAS.*, ROWNUM RN FROM (");
|
||||
newSql.append(sql);
|
||||
newSql.append(") TEMP_DATAS WHERE ROWNUM <= ").append(limitOffset + limitRows).append(") WHERE RN > ").append(limitOffset);
|
||||
return newSql;
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
/**
|
||||
* Sybase 处理器
|
||||
* 适合 {@link DbType#SYBASE}
|
||||
*/
|
||||
LimitOffsetProcessor SYBASE = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
//SELECT TOP 1 START AT 3 * FROM
|
||||
sql.insert(6, TOP + limitRows + START_AT + (limitOffset + 1));
|
||||
} else if (limitRows != null) {
|
||||
sql.insert(6, TOP + limitRows);
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
/**
|
||||
* SqlServer 2005 limit 处理器
|
||||
*/
|
||||
LimitOffsetProcessor SQLSERVER_2005 = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null) {
|
||||
if (limitOffset == null) {
|
||||
limitOffset = 0;
|
||||
}
|
||||
StringBuilder newSql = new StringBuilder("SELECT * FROM (SELECT TEMP_DATAS.*, ROW_NUMBER() OVER() AS RN FROM (");
|
||||
newSql.append(sql).append(") AS TEMP_DATAS) WHERE RN > ").append(limitOffset).append(" AND RN <= ").append(limitRows + limitRows);
|
||||
return newSql;
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* 处理构建 limit 和 offset
|
||||
*
|
||||
* @param sql 已经构建的 sql
|
||||
* @param queryWrapper 参数内容
|
||||
* @param limitRows 用户传入的 limit 参数 可能为 null
|
||||
* @param limitOffset 用户传入的 offset 参数，可能为 null
|
||||
*/
|
||||
StringBuilder process(StringBuilder sql, QueryWrapper queryWrapper, Integer limitRows, Integer limitOffset);
|
||||
/**
|
||||
* Informix 的处理器
|
||||
* 适合 {@link DbType#INFORMIX}
|
||||
* 文档 {@link <a href="https://www.ibm.com/docs/en/informix-servers/14.10?topic=clause-restricting-return-values-skip-limit-first-options">https://www.ibm.com/docs/en/informix-servers/14.10?topic=clause-restricting-return-values-skip-limit-first-options</a>}
|
||||
*/
|
||||
LimitOffsetProcessor INFORMIX = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
// SELECT SKIP 2 FIRST 1 * FROM
|
||||
sql.insert(6, SKIP + limitOffset + FIRST + limitRows);
|
||||
} else if (limitRows != null) {
|
||||
sql.insert(6, FIRST + limitRows);
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
/**
|
||||
* Firebird 的处理器
|
||||
* 适合 {@link DbType#FIREBIRD}
|
||||
*/
|
||||
LimitOffsetProcessor FIREBIRD = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
// ROWS 2 TO 3
|
||||
sql.append(ROWS).append(limitOffset).append(TO).append(limitOffset + limitRows);
|
||||
} else if (limitRows != null) {
|
||||
sql.insert(6, FIRST + limitRows);
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
/**
|
||||
* Oracle11g及以下数据库的处理器
|
||||
* 适合 {@link DbType#ORACLE,DbType#DM,DbType#GAUSS}
|
||||
*/
|
||||
LimitOffsetProcessor ORACLE = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null) {
|
||||
if (limitOffset == null) {
|
||||
limitOffset = 0;
|
||||
}
|
||||
StringBuilder newSql = new StringBuilder("SELECT * FROM (SELECT TEMP_DATAS.*, ROWNUM RN FROM (");
|
||||
newSql.append(sql);
|
||||
newSql.append(") TEMP_DATAS WHERE ROWNUM <= ").append(limitOffset + limitRows).append(") WHERE RN > ").append(limitOffset);
|
||||
return newSql;
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
/**
|
||||
* Sybase 处理器
|
||||
* 适合 {@link DbType#SYBASE}
|
||||
*/
|
||||
LimitOffsetProcessor SYBASE = (sql, queryWrapper, limitRows, limitOffset) -> {
|
||||
if (limitRows != null && limitOffset != null) {
|
||||
//SELECT TOP 1 START AT 3 * FROM
|
||||
sql.insert(6, TOP + limitRows + START_AT + (limitOffset + 1));
|
||||
} else if (limitRows != null) {
|
||||
sql.insert(6, TOP + limitRows);
|
||||
}
|
||||
return sql;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* 处理构建 limit 和 offset
|
||||
*
|
||||
* @param sql 已经构建的 sql
|
||||
* @param queryWrapper 参数内容
|
||||
* @param limitRows 用户传入的 limit 参数 可能为 null
|
||||
* @param limitOffset 用户传入的 offset 参数，可能为 null
|
||||
*/
|
||||
StringBuilder process(StringBuilder sql, QueryWrapper queryWrapper, Integer limitRows, Integer limitOffset);
|
||||
}
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user