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优化count查询兼容informix

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Looly
2023-05-09 10:10:37 +08:00
parent ffe5a08628
commit 17357d29b5
2 changed files with 5 additions and 2 deletions
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3
CHANGELOG.md
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@@ -3,7 +3,7 @@
------------------------------------------------------------------------------------------------------------- -------------------------------------------------------------------------------------------------------------
# 6.0.0.M1 (2023-04-23) # 6.0.0.M4 (2023-05-09)
### 计划实现 ### 计划实现
* 【poi 】 Markdown相关（如HTML转换等），基于commonmark-java * 【poi 】 Markdown相关（如HTML转换等），基于commonmark-java
@@ -14,5 +14,6 @@
### ❌不兼容特性 ### ❌不兼容特性
### 🐣新特性 ### 🐣新特性
* 【db 】 优化count查询兼容informix（issue#I713XQ@Gitee）
### 🐞Bug修复 ### 🐞Bug修复

4
hutool-db/src/main/java/org/dromara/hutool/db/dialect/Dialect.java
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@@ -160,8 +160,10 @@ public interface Dialect extends Serializable {
* @since 5.7.2 * @since 5.7.2
*/ */
default PreparedStatement psForCount(final Connection conn, SqlBuilder sqlBuilder) throws SQLException { default PreparedStatement psForCount(final Connection conn, SqlBuilder sqlBuilder) throws SQLException {
// https://gitee.com/dromara/hutool/issues/I713XQ
// 为了兼容informix等数据库，此处使用count(*)而非count(1)
sqlBuilder = sqlBuilder sqlBuilder = sqlBuilder
.insertPreFragment("SELECT count(1) from(") .insertPreFragment("SELECT count(*) from(")
// issue#I3IJ8X@Gitee，在子查询时需设置单独别名，此处为了防止和用户的表名冲突，使用自定义的较长别名 // issue#I3IJ8X@Gitee，在子查询时需设置单独别名，此处为了防止和用户的表名冲突，使用自定义的较长别名
.append(") hutool_alias_count_"); .append(") hutool_alias_count_");
return psForPage(conn, sqlBuilder, null); return psForPage(conn, sqlBuilder, null);