Java调用存储过程和存储函数

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使用Java语言调用存储过程与存储函数

1.JDBC工具类

<!-- https://mvnrepository.com/artifact/com.github.noraui/ojdbc8 -->
<dependency>
    <groupId>com.github.noraui</groupId>
    <artifactId>ojdbc8</artifactId>
    <version>12.2.0.1</version>
</dependency>

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class JDBCUtils {
    private static String url = "jdbc:oracle:thin:@1.1.1.1:1521:cdb1";
    private static String driverClass = "oracle.jdbc.OracleDriver";
    private static String userName = "c##solang";
    private static String password = "solang";

    /**
     * @return 获取数据库连接
     */
    public static Connection getConnection() {
        try {
            Class.forName(driverClass);
            return DriverManager.getConnection(url, userName, password);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * 释放数据库连接
     * @param conn
     * @param st
     * @param rs
     */
    public static void close(Connection conn, Statement st, ResultSet rs) {
        try {
            if (rs != null) {
                rs.close();
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        try {
            if (st != null) {
                st.close();
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        try {
            if (conn != null) {
                conn.close();
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}

2.JDBC调用存储过程

例，输入员工编号，输出员工名称和薪资

create or replace procedure queryEmpNameSal(in_empno in number,
                                            out_ename out varchar2,
                                            out_sal out number)
as 
begin
  select ename,sal into out_ename,out_sal from emp where empno = in_empno;
end;

调用存储过程{call <procedure-name>[(<arg1>, <arg2>, ...)]}，一个问号代表一个参数，从1开始。

import java.sql.CallableStatement;
import java.sql.Connection;
import oracle.jdbc.OracleTypes;
import org.junit.Test;

@Test
public void testProcedure() throws Exception {
    Connection conn = null;
    CallableStatement call = null;
    String sql = "{ call queryEmpNameSal(?,?,?) }";
    try {
        conn = JDBCUtils.getConnection();
        /** 调用存储过程使用CallableStatement */
        call = conn.prepareCall(sql);
        
        /** 设置输入参数 */
        call.setInt(1, 7369);
        /** 设置输出参数 */
        call.registerOutParameter(2, OracleTypes.VARCHAR);
        call.registerOutParameter(3, OracleTypes.NUMBER);
        
        /** 执行 */
        call.execute();
        
        /** 获取返回的结果(out输出参数) */
        String outEname = call.getString(2);
        Double outSal = call.getDouble(3);
        
        System.out.println(outEname + "的工资是:" + outSal);
    } finally {
        /** 释放资源 */
        JDBCUtils.close(conn, call, null);
    }
}

SMITH的工资是:800.0

3.JDBC调用存储函数

例，查询某职工全年的总收入

create or replace function queryEmpSalary(in_empno in number)
return number
as
 pSal number; -- 定义变量保存员工的工资
 pComm number; -- 定义变量保存员工的奖金
begin
 select sal,comm into pSal,pComm from emp where empno = in_empno;
 return pSal * 12 + nvl(pComm,0);
end;

调用存储函数{ ?= call <function-name>[(<arg1>, <arg2>, ...)]}，一个问号代表一个参数，从1开始，第一个参数表示返回值。

import java.sql.CallableStatement;
import java.sql.Connection;
import oracle.jdbc.OracleTypes;
import org.junit.Test;

@Test
public void testFunction() throws Exception {
    Connection conn = null;
    CallableStatement call = null;
    String sql = "{ ?= call queryEmpSalary(?) }";
    try {
        conn = JDBCUtils.getConnection();
        /** 调用存储过程使用CallableStatement */
        call = conn.prepareCall(sql);
        
        /** 设置输入参数 */
        call.setInt(2, 7369);
        /** 返回值 */
        call.registerOutParameter(1, OracleTypes.NUMBER);
        
        /** 执行 */
        call.execute();
        
        /** 获取返回值 */
        Double totalSal = call.getDouble(1);
        
        System.out.println("全年的总工资是:" + totalSal);
    } finally {
        /** 释放资源 */
        JDBCUtils.close(conn, call, null);
    }
}

全年的总工资是:9600.0