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!491 fix: QueryWrapper无法支持常量查询

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weichangming 2025-02-13 17:23:19 +08:00
parent e74e4044d1
commit 2b22bdc015
3 changed files with 37 additions and 2 deletions
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1
mybatis-flex-core/src/main/java/com/mybatisflex/core/constant/SqlConsts.java
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@ -56,6 +56,7 @@ public final class SqlConsts {
public static final String THEN = " THEN "; public static final String THEN = " THEN ";
public static final String ELSE = " ELSE "; public static final String ELSE = " ELSE ";
public static final String FROM = " FROM "; public static final String FROM = " FROM ";
public static final String DUAL = "DUAL";
public static final String WHERE = " WHERE "; public static final String WHERE = " WHERE ";
public static final String SELECT = "SELECT "; public static final String SELECT = "SELECT ";
public static final String VALUES = " VALUES "; public static final String VALUES = " VALUES ";

8
mybatis-flex-core/src/main/java/com/mybatisflex/core/dialect/impl/CommonsDialectImpl.java
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@ -58,6 +58,7 @@ import static com.mybatisflex.core.constant.SqlConsts.BRACKET_RIGHT;
import static com.mybatisflex.core.constant.SqlConsts.DELETE; import static com.mybatisflex.core.constant.SqlConsts.DELETE;
import static com.mybatisflex.core.constant.SqlConsts.DELETE_FROM; import static com.mybatisflex.core.constant.SqlConsts.DELETE_FROM;
import static com.mybatisflex.core.constant.SqlConsts.DELIMITER; import static com.mybatisflex.core.constant.SqlConsts.DELIMITER;
import static com.mybatisflex.core.constant.SqlConsts.DUAL;
import static com.mybatisflex.core.constant.SqlConsts.EMPTY; import static com.mybatisflex.core.constant.SqlConsts.EMPTY;
import static com.mybatisflex.core.constant.SqlConsts.EQUALS; import static com.mybatisflex.core.constant.SqlConsts.EQUALS;
import static com.mybatisflex.core.constant.SqlConsts.EQUALS_PLACEHOLDER; import static com.mybatisflex.core.constant.SqlConsts.EQUALS_PLACEHOLDER;
@ -102,7 +103,8 @@ public class CommonsDialectImpl implements IDialect {
@Override @Override
public String wrap(String keyword) { public String wrap(String keyword) {
return ASTERISK.equals(keyword) ? keyword : keywordWrap.wrap(keyword); return ASTERISK.equals(keyword) || DUAL.equalsIgnoreCase(StringUtil.tryTrim(keyword)) ?
keyword : keywordWrap.wrap(keyword);
} }
@Override @Override
@ -438,7 +440,9 @@ public class CommonsDialectImpl implements IDialect {
buildSelectColumnSql(sqlBuilder, allTables, selectColumns, CPI.getHint(queryWrapper)); buildSelectColumnSql(sqlBuilder, allTables, selectColumns, CPI.getHint(queryWrapper));
sqlBuilder.append(FROM).append(StringUtil.join(DELIMITER, queryTables, queryTable -> queryTable.toSql(this, OperateType.SELECT))); if(CollectionUtil.isNotEmpty(queryTables)) {
sqlBuilder.append(FROM).append(StringUtil.join(DELIMITER, queryTables, queryTable -> queryTable.toSql(this, OperateType.SELECT)));
}
buildJoinSql(sqlBuilder, queryWrapper, allTables, OperateType.SELECT); buildJoinSql(sqlBuilder, queryWrapper, allTables, OperateType.SELECT);
buildWhereSql(sqlBuilder, queryWrapper, allTables, true); buildWhereSql(sqlBuilder, queryWrapper, allTables, true);

30
mybatis-flex-core/src/test/java/com/mybatisflex/coretest/QueryWrapperTest.java
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@ -80,4 +80,34 @@ public class QueryWrapperTest {
Assert.assertEquals(CPI.getValueArray(wrapper).length, 3); Assert.assertEquals(CPI.getValueArray(wrapper).length, 3);
} }
/**
* https://github.com/mybatis-flex/mybatis-flex/issues/491
*/
@Test
public void testIssues491() {
String demo1 = "SELECT c1 FROM ((SELECT 1 as c1) UNION ALL (SELECT 2 as c1) UNION ALL (SELECT 3 as c1)) AS `t`";
QueryWrapper query1 = QueryWrapper.create()
.select("c1")
.from(QueryWrapper.create().select("1 as c1")
.unionAll(QueryWrapper.create().select("2 as c1"))
.unionAll(QueryWrapper.create().select("3 as c1")))
.as("t");
Assert.assertTrue(query1.toSQL().equals(demo1));
String demo2 = "SELECT c1 FROM ((SELECT 1 as c1 FROM dual) UNION ALL (SELECT 2 as c1 FROM dual) UNION ALL " +
"(SELECT 3 as c1 FROM dual)) AS `t`";
QueryWrapper query2 = QueryWrapper.create()
.select("c1")
.from(QueryWrapper.create().select("1 as c1").from("dual")
.unionAll(QueryWrapper.create().select("2 as c1").from("dual"))
.unionAll(QueryWrapper.create().select("3 as c1").from("dual")))
.as("t");
Assert.assertTrue(query2.toSQL().equals(demo2));
}
} }