MyBatis SQL 生成方法 增删改查
此类根据JAVA实体BEAN生成MYBATIS的接口SQL（mapper）
package com.sicdt.sicsign.bill.service.hessian;
import java.lang.reflect.Field;
import com.sicdt.sicsign.bill.service.entity.InvoiceEntity;
public class MyBatisSqlUtils {
public static void main(String[] args) {
String tableName = "T_INVOICE";
Class<?> clazz = InvoiceEntity.class;
System.out.println("主键查询SQL：======================================");
String idSql = MyBatisSqlUtils.selectSQLById(clazz, tableName);
System.out.println("主键查询SQL： " + idSql);
String idSqlHump = MyBatisSqlUtils.selectSQLByIdForHump(clazz, tableName);
System.out.println("主键查询SQL： " + idSqlHump);
System.out.println("主键集合查询SQL：======================================");
String idsSql = MyBatisSqlUtils.selectSQLByIds(clazz, tableName);
System.out.println("主键集合查询SQL： " + idsSql);
String idsSqlHump = MyBatisSqlUtils.selectSQLByIdsForHump(clazz, tableName);
System.out.println("主键集合查询SQL： " + idsSqlHump);
System.out.println("查询SQL：======================================");
String selectSql = MyBatisSqlUtils.selectSQL(clazz,tableName);
System.out.println("查询SQL： " + selectSql);
String selectSqlHump = MyBatisSqlUtils.selectSQLForHump(clazz,tableName);
System.out.println("查询SQL： " + selectSqlHump);
System.out.println("插入SQL：======================================");
String insertSql = MyBatisSqlUtils.insertSql(clazz, tableName);
System.out.println("插入SQL： "+insertSql);
String insertSqlHump = MyBatisSqlUtils.insertSqlForHump(clazz, tableName);
System.out.println("插入SQL： "+insertSqlHump);
System.out.println("删除SQL：======================================");
String deleteSql = MyBatisSqlUtils.deleteSqlById(clazz, tableName);
System.out.println("删除SQL： "+deleteSql);
String deleteSqlHump = MyBatisSqlUtils.deleteSqlByIdForHump(clazz, tableName);
System.out.println("删除SQL： "+deleteSqlHump);
System.out.println("修改SQL：======================================");
String updateSql = MyBatisSqlUtils.updateSql(clazz, tableName);
System.out.println("修改SQL： "+updateSql);
String updateSqlHump = MyBatisSqlUtils.updateSqlForHump(clazz, tableName);
System.out.println("修改SQL： "+updateSqlHump);
System.out.println("批量插入SQL：======================================");
String batchInsertSql = MyBatisSqlUtils.batchInsertSql(clazz, tableName);
System.out.println("批量插入SQL："+batchInsertSql);
String batchInsertSqlHump = MyBatisSqlUtils.batchInsertSqlForHump(clazz, tableName);
System.out.println("批量插入SQL："+batchInsertSqlHump);
System.out.println("批量更新SQL：======================================");
String batchUpdateSql = MyBatisSqlUtils.batchUpdateSql(clazz, tableName);
System.out.println("批量更新SQL："+batchUpdateSql);
String batchUpdateSqlHump = MyBatisSqlUtils.batchUpdateSqlForHump(clazz, tableName);
System.out.println("批量更新SQL："+batchUpdateSqlHump);
System.out.println("批量删除SQL（主键）：======================================");
String batchDeleteSqlByIds = MyBatisSqlUtils.batchDeleteSqlByIds(clazz, tableName);
System.out.println("批量删除SQL（主键）："+batchDeleteSqlByIds);
String batchDeleteSqlHumpByIds = MyBatisSqlUtils.batchDeleteSqlByIdsForHump(clazz, tableName);
System.out.println("批量删除SQL（主键）："+batchDeleteSqlHumpByIds);
System.out.println("批量删除SQL（实体）：======================================");
String batchDeleteSql = MyBatisSqlUtils.batchDeleteSql(clazz, tableName);
System.out.println("批量删除SQL（实体）："+batchDeleteSql);
String batchDeleteSqlHump = MyBatisSqlUtils.batchDeleteSqlForHump(clazz, tableName);
System.out.println("批量删除SQL（实体）："+batchDeleteSqlHump);
}
/**
* <br>描 述: 生成查询SQL（实体属性与数据库一致）主键查询
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String selectSQLById(Class<?> clazz,String tableName){
return selectSQLById(clazz, tableName, false);
}
/**
* <br>描 述: 生成查询SQL（实体属性为驼峰）主键查询
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String selectSQLByIdForHump(Class<?> clazz,String tableName){
return selectSQLById(clazz, tableName, true);
}
/**
* <br>描 述: 生成查询SQL（实体属性与数据库一致）主键集合查询
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String selectSQLByIds(Class<?> clazz,String tableName){
return selectSQLByIds(clazz, tableName, false);
}
/**
* <br>描 述: 生成查询SQL（实体属性为驼峰）主键集合查询
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String selectSQLByIdsForHump(Class<?> clazz,String tableName){
return selectSQLByIds(clazz, tableName, true);
}
/**
* <br>描 述: 生成查询SQL（实体属性与数据库一致）条件查询
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String selectSQL(Class<?> clazz,String tableName){
return selectSQL(clazz, tableName, false);
}
/**
* <br>描 述: 生成查询SQL（实体属性为驼峰）条件查询
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String selectSQLForHump(Class<?> clazz,String tableName){
return selectSQL(clazz, tableName, true);
}
/**
* <br>描 述: 生成插入SQL（实体属性与数据库一致）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String insertSql(Class<?> clazz,String tableName){
return insertSql(clazz, tableName, false);
}
/**
* <br>描 述: 生成插入SQL（实体属性为驼峰）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String insertSqlForHump(Class<?> clazz,String tableName){
return insertSql(clazz, tableName, true);
}
/**
* <br>描 述: 生成更新Sql（实体属性与数据库一致）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String updateSql(Class<?> clazz,String tableName){
return updateSql(clazz, tableName, false);
}
/**
* <br>描 述: 生成更新SQL（实体属性为驼峰）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String updateSqlForHump(Class<?> clazz,String tableName){
return updateSql(clazz, tableName, true);
}
/**
* <br>描 述: 生成删除SQL（实体属性与数据库一致）主键删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String deleteSqlById(Class<?> clazz,String tableName){
return deleteSqlById(clazz, tableName, false);
}
/**
* <br>描 述: 生成删除SQL（实体属性为驼峰）主键删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String deleteSqlByIdForHump(Class<?> clazz,String tableName){
return deleteSqlById(clazz, tableName, true);
}
/**
* <br>描 述: 生成删除SQL（实体属性与数据库一致）实体删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String deleteSql(Class<?> clazz,String tableName){
return deleteSqlById(clazz, tableName, false);
}
/**
* <br>描 述: 生成删除SQL（实体属性为驼峰）实体删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String deleteSqlForHump(Class<?> clazz,String tableName){
return deleteSqlById(clazz, tableName, true);
}
/**
* <br>描 述: 生成批量插入SQL（实体属性与数据库一致）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchInsertSql(Class<?> clazz,String tableName){
return batchInsertSql(clazz, tableName, false);
}
/**
* <br>描 述: 生成批量插入SQL（实体属性为驼峰）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchInsertSqlForHump(Class<?> clazz,String tableName){
return batchInsertSql(clazz, tableName, true);
}
/**
* <br>描 述: 生成批量更新SQL（实体属性与数据库一致）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchUpdateSql(Class<?> clazz,String tableName){
return batchUpdateSql(clazz, tableName, false);
}
/**
* <br>描 述: 生成批量更新SQL（实体属性为驼峰）
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchUpdateSqlForHump(Class<?> clazz,String tableName){
return batchUpdateSql(clazz, tableName, true);
}
/**
* <br>描 述: 生成批量删除SQL（实体属性与数据库一致）主键删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchDeleteSqlByIds(Class<?> clazz,String tableName){
return batchDeleteSqlByIds(clazz, tableName, false);
}
/**
* <br>描 述: 生成批量删除SQL（实体属性为驼峰）实体删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchDeleteSqlByIdsForHump(Class<?> clazz,String tableName){
return batchDeleteSqlByIds(clazz, tableName, true);
}
/**
* <br>描 述: 生成批量删除SQL（实体属性与数据库一致）主键删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchDeleteSql(Class<?> clazz,String tableName){
return batchDeleteSql(clazz, tableName, false);
}
/**
* <br>描 述: 生成批量删除SQL（实体属性为驼峰）实体删除
* <br>作 者: shizhenwei
* @param clazz Object.class
* @param tableName 表名称
* @return
*/
public static String batchDeleteSqlForHump(Class<?> clazz,String tableName){
return batchDeleteSql(clazz, tableName, true);
}
/*
* 生成查询SQL 主键查询
*/
private static String selectSQLById(Class<?> clazz,String tableName,boolean isHump){
String select = "@Select(\"SELECT";
Field[] fields = clazz.getDeclaredFields();
select += getSelectColumns(fields,isHump)
+" FROM "+tableName
+" WHERE "+getSelectColumn(fields[0],isHump)+" = "+getValueColumn(fields[0])+"\")";
return select;
}
/*
* 生成查询SQL主键集合查询
*/
private static String selectSQLByIds(Class<?> clazz,String tableName,boolean isHump){
String select = "@Select(\"<script>\""
+"\r+\"SELECT";
Field[] fields = clazz.getDeclaredFields();
select += getSelectColumns(fields,isHump)
+" FROM "+tableName
+" WHERE "+getSelectColumn(fields[0],isHump)+" IN \""
+"\r+\"<foreach collection='primaryKeys' item='"+fields[0].getName()+"' index='index' open='(' close=')' separator=','>\""
+"\r+\""+getValueColumn(fields[0])+"\""
+"\r+\"</foreach>\""
+"\r+\"</script>\")";
return select;
}
/*
* 生成查询SQL 条件查询
*/
private static String selectSQL(Class<?> clazz,String tableName,boolean isHump){
//接口引用加\" 生成双引号
String select = "@Select(\"<script>\""
+"\r+\"SELECT";
Field[] fields = clazz.getDeclaredFields();
select += getSelectColumns(fields,isHump)
+" FROM "+tableName+"\""
+"\r+\"<trim prefix='WHERE' prefixOverrides='and|or'>\"";
for(Field field : fields){
if(isHump){
select += "\r+\"<if test='"+field.getName()+" != null'> AND "+getSelectColumn(field,isHump)+" = "+getValueColumn(field)+"</if>\"";
}else{
select += "\r+\"<if test='"+field.getName()+" != null'> AND "+field.getName()+" = "+getValueColumn(field)+"</if>\"";
}
}
select += "\r+\"</trim>\""
+"\r+\"</script>\")";
return select;
}
/*
* 生成插入SQL
*/
private static String insertSql(Class<?> clazz,String tableName,boolean isHump){
String insert = "@Insert(\"INSERT INTO "+tableName;
Field[] fields = clazz.getDeclaredFields();
insert += " ("+getInsertColumns(fields,isHump)+")"
+" VALUES ("+getValueColumns(fields,false)+")"
+"\")";
return insert;
}
/*
* 生成更新SQL
*/
private static String updateSql(Class<?> clazz,String tableName,boolean isHump){
Field[] fields = clazz.getDeclaredFields();
String idColumn;
if(isHump){
idColumn = getSelectColumn(fields[0],isHump);
}else{
idColumn = fields[0].getName();
}
String idVal = getValueColumn(fields[0]);
String update = "@Update(\"<script>\""
+"\r+\"UPDATE "+tableName+"\""
+"\r+\"<trim prefix='set' suffixOverrides=',' suffix='WHERE "+idColumn+"="+idVal+"'>\"";
for(int i=1; i<fields.length; i++){
Field field = fields[i];
if(isHump){
update += "\r+\"<if test='"+field.getName()+"!=null'>"+getSelectColumn(field,isHump)+"="+getValueColumn(field)+",</if>\"";
}else{
update += "\r+\"<if test='"+field.getName()+"!=null'>"+field.getName()+"="+getValueColumn(field)+",</if>\"";
}
}
update += "\r+\"</trim>\""
+"\r+\"</script>\")";
return update;
}
/*
* 生成删除SQL
*/
private static String deleteSqlById(Class<?> clazz,String tableName,boolean isHump){
String delete = "@Delete(\"DELETE FROM "+tableName+" WHERE ";
Field field = clazz.getDeclaredFields()[0];
String column = getSelectColumn(field,isHump);
delete += column+" = "+getValueColumn(field)+"\")";
return delete;
}
/*
* 生成批量插入SQL
*/
private static String batchInsertSql(Class<?> clazz,String tableName,boolean isHump){
String insert = "@Insert(\"<script>\""
+"\r+\"INSERT INTO "+tableName+"\"";
Field[] fields = clazz.getDeclaredFields();
insert += "\r+\"("+getInsertColumns(fields,isHump)+")\""
+"\r+\"VALUES \""
+"\r+\"<foreach collection='list' item='item' index='index' separator=','>\""
+"\r+\"("+getValueColumns(fields,true)+")\""
+"\r+\"</foreach>\""
+"\r+\"</script>\")";
return insert;
}
/*
* 生成批量更新SQL
*/
private static String batchUpdateSql(Class<?> clazz,String tableName,boolean isHump){
Field[] fields = clazz.getDeclaredFields();
String idColumn;
if(isHump){
idColumn = getSelectColumn(fields[0],isHump);
}else{
idColumn = fields[0].getName();
}
String idVal = getValueColumn(fields[0],true);
String update = "@Update(\"<script>\""
+"\r+\"<foreach collection='list' item='item' index='index' open='' close='' separator=';'>\""
+"\r+\"UPDATE "+tableName+"\""
+"\r+\"<trim prefix='set' suffixOverrides=',' suffix='WHERE "+idColumn+"="+idVal+"'>\"";
for(int i=1; i<fields.length; i++){
Field field = fields[i];
if(isHump){
update += "\r+\"<if test='item."+field.getName()+"!=null'>"+getSelectColumn(field,isHump)+"="+getValueColumn(field,true)+",</if>\"";
}else{
update += "\r+\"<if test='item."+field.getName()+"!=null'>"+field.getName()+"="+getValueColumn(field,true)+",</if>\"";
}
}
update += "\r+\"</trim>\""
+"\r+\"</foreach>\""
+"\r+\"</script>\")";
return update;
}
/*
* 生成批量删除SQL 主键删除
*/
private static String batchDeleteSqlByIds(Class<?> clazz,String tableName,boolean isHump){
String delete = "@Delete(\"<script>\""
+"\r+\"DELETE FROM "+tableName+" WHERE ";
Field field = clazz.getDeclaredFields()[0];
String column = getSelectColumn(field,isHump);
delete += column+" IN \""
+"\r+\"<foreach collection='primaryKeys' item='"+field.getName()+"' index='index' open='(' close=')' separator=','>\""
+"\r+\""+getValueColumn(field)+"\""
+"\r+\"</foreach>\""
+"\r+\"</script>\")";
return delete;
}
/*
* 生成批量删除SQL 实体删除
*/
private static String batchDeleteSql(Class<?> clazz,String tableName,boolean isHump){
String delete = "@Delete(\"<script>\""
+"\r+\"DELETE FROM "+tableName+" WHERE ";
Field field = clazz.getDeclaredFields()[0];
String column = getSelectColumn(field,isHump);
delete += column+" in \""
+"\r+\"<foreach collection='list' item='item' index='index' open='(' close=')' separator=','>\""
+"\r+\""+getValueColumn(field,true)+"\""
+"\r+\"</foreach>\""
+"\r+\"</script>\")";
return delete;
}
/*
* 获SELECT取列
*/
private static String getSelectColumns(Field[] fields,boolean isHump){
String columns = "";
if(isHump){
for(Field field : fields){
columns += " "+getSelectColumn(field, isHump) +" AS "+field.getName()+",";
}
}else{
for(Field field : fields){
columns+=" "+getSelectColumn(field, isHump)+" AS "+field.getName()+",";
}
}
return columns.substring(0,columns.length()-1);
}
/*
* 获INSERT列
*/
private static String getInsertColumns(Field[] fields,boolean isHump){
String columns = "";
if(isHump){
for(Field field : fields){
columns += " "+getSelectColumn(field, isHump)+",";
}
}else{
for(Field field : fields){
columns+=" "+getSelectColumn(field, isHump)+",";
}
}
return columns.substring(0,columns.length()-1).toUpperCase();
}
/*
* 获insert取列
*/
private static String getValueColumns(Field[] fields,boolean isBatch){
String columns = "";
for(Field field : fields){
columns+=" "+getValueColumn(field,isBatch)+",";
}
return columns.substring(0, columns.length()-1);
}
/*
* 获取单列
*/
private static String getSelectColumn(Field field,boolean isHump){
String fieldName = field.getName();
String column = "";
if(isHump){
for(int i=0; i<fieldName.length(); i++){
char ch = fieldName.charAt(i);
if(Character.isUpperCase(ch)){
column += "_"+ch;
}else{
column += ch;
}
}
}else{
column = fieldName;
}
return column.toUpperCase();
}
/*
* 获取单值列
*/
private static String getValueColumn(Field field,boolean isBatch){
if(isBatch){
return "#{item."+field.getName()+"}";
}else{
return "#{"+field.getName()+"}";
}
}
/*
* 获取单值列
*/
private static String getValueColumn(Field field){
return getValueColumn(field,false);
}
}
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