fix code

hutool-db/src/main/java/cn/hutool/v7/db/config/DbConfig.java

@@ -16,7 +16,6 @@
 
 package cn.hutool.v7.db.config;
 
-import cn.hutool.v7.db.Db;
 import cn.hutool.v7.db.dialect.Dialect;
 import cn.hutool.v7.db.driver.DriverUtil;
 import cn.hutool.v7.db.ds.DSFactory;

hutool-db/src/main/java/cn/hutool/v7/db/driver/DriverIdentifier.java

@@ -38,7 +38,7 @@ public class DriverIdentifier implements DriverNames {
 	/**
 	 * 单例驱动识别器
 	 */
-	public static DriverIdentifier INSTANCE = new DriverIdentifier(null);
+	public static final DriverIdentifier INSTANCE = new DriverIdentifier(null);
 
 	private final List<DriverMatcher> matcherList;
 

hutool-db/src/main/java/cn/hutool/v7/db/meta/ColumnIndex.java

@@ -18,6 +18,7 @@ package cn.hutool.v7.db.meta;
 
 import cn.hutool.v7.db.DbException;
 
+import java.io.Serial;
 import java.io.Serializable;
 import java.sql.ResultSet;
 import java.sql.SQLException;
@@ -29,6 +30,7 @@ import java.sql.SQLException;
  * @since 5.7.23
  */
 public class ColumnIndex implements Serializable, Cloneable {
+	@Serial
 	private static final long serialVersionUID = 1L;
 
 	/**
@@ -67,20 +69,44 @@ public class ColumnIndex implements Serializable, Cloneable {
 		this.ascOrDesc = ascOrDesc;
 	}
 
+	/**
+	 * 获取索引列名
+	 *
+	 * @return 索引列名
+	 */
 	public String getColumnName() {
 		return columnName;
 	}
 
-	public void setColumnName(final String columnName) {
+	/**
+	 * 设置索引列名
+	 *
+	 * @param columnName 索引列名
+	 * @return this
+	 */
+	public ColumnIndex setColumnName(final String columnName) {
 		this.columnName = columnName;
+		return this;
 	}
 
+	/**
+	 * 获取索引列排序顺序
+	 *
+	 * @return 索引列排序顺序
+	 */
 	public String getAscOrDesc() {
 		return ascOrDesc;
 	}
 
-	public void setAscOrDesc(final String ascOrDesc) {
+	/**
+	 * 设置索引列排序顺序
+	 *
+	 * @param ascOrDesc 索引列排序顺序
+	 * @return this
+	 */
+	public ColumnIndex setAscOrDesc(final String ascOrDesc) {
 		this.ascOrDesc = ascOrDesc;
+		return this;
 	}
 
 	@Override