Merge pull request #374 from owenludong/master

为非时间类型的字段添加字符串到日期的转换函数

src/main/java/com/alibaba/druid/sql/SQLUtils.java

@@ -39,6 +39,9 @@ import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
 import com.alibaba.druid.support.logging.Log;
 import com.alibaba.druid.support.logging.LogFactory;
 import com.alibaba.druid.util.JdbcUtils;
+import com.alibaba.druid.util.JdbcConstants;
+import com.alibaba.druid.util.StringUtils;
+
 
 public class SQLUtils {
 
@@ -240,4 +243,37 @@ public class SQLUtils {
         }
         return stmtList;
     }
+	
+	 /**
+     * @author owenludong.lud
+     * @param  columnName
+     * @param  tableAlias 
+     * @param  pattern if pattern is null,it will be set {%Y-%m-%d %H:%i:%s} as mysql default value and set {yyyy-mm-dd hh24:mi:ss} as oracle default value
+     * @param  dbType  {@link JdbcConstants} if dbType is null ,it will be set the mysql as a default value
+     */
+    public static String buildToDate(String columnName,String tableAlias,String pattern,String dbType){    	
+     	StringBuilder sql = new StringBuilder();    	
+     	if(StringUtils.isEmpty(columnName))
+     		return "";  			
+     	if(StringUtils.isEmpty(dbType))    dbType = JdbcConstants.MYSQL;   
+     	String formatMethod = "";
+     	if(JdbcConstants.MYSQL.equalsIgnoreCase(dbType)){
+     		formatMethod = "STR_TO_DATE";
+     		if(StringUtils.isEmpty(pattern)) pattern = "%Y-%m-%d %H:%i:%s";
+     	}else if(JdbcConstants.ORACLE.equalsIgnoreCase(dbType)){
+     		formatMethod = "TO_DATE";
+     		if(StringUtils.isEmpty(pattern)) pattern = "yyyy-mm-dd hh24:mi:ss";
+     	}else{     		
+     		return "";
+     		//expand date's handle method for other database 
+     	}
+     	sql.append(formatMethod).append("(");        	
+ 		if(!StringUtils.isEmpty(tableAlias))
+ 			sql.append(tableAlias).append("."); 
+ 		sql.append(columnName).append(",");
+ 		sql.append("'");
+ 		sql.append(pattern);
+ 		sql.append("')");     	   	
+     	return sql.toString();
+     }
 }

src/test/java/com/alibaba/druid/bvt/utils/JdbcUtilsTest.java

@@ -78,5 +78,5 @@ public class JdbcUtilsTest extends TestCase {
             List<Map<String, Object>> list = JdbcUtils.executeQuery(dataSource, "select * from user");
             Assert.assertEquals(0, list.size());
         }
-    }
+    }   
 }