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How to use quotes correctly while using LIKE with search variable in MySQL in Java?
Following is the correct syntax to use LIKE with search variable −
String sqlQuery; sqlQuery = "select *from yourTableName where yourColumnName like '%" +yourSearchVariableName + "%'";
Let us create a table −
mysql> create table demo19 −> ( −> id int not null auto_increment primary key, −> name varchar(50) −> ); Query OK, 0 rows affected (3.48 sec)
Insert some records into the table with the help of insert command −
mysql> insert into demo19(name) values('John Smith');
Query OK, 1 row affected (0.15 sec)
mysql> insert into demo19(name) values('David Miller');
Query OK, 1 row affected (0.15 sec)
mysql> insert into demo19(name) values('Adam Smith');
Query OK, 1 row affected (0.12 sec)
mysql> insert into demo19(name) values('Chris Brown');
Query OK, 1 row affected (0.13 sec)Display records from the table using select statement −
mysql> select *from demo19
This will produce the following output −
+----+--------------+ | id | name | +----+--------------+ | 1 | John Smith | | 2 | David Miller | | 3 | Adam Smith | | 4 | Chris Brown | +----+--------------+ 4 rows in set (0.00 sec)
Example
Following is the Java code to use quotes correctly while using LIKE with search variable −
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class RemoveJavaQueryError {
public static void main(String[] args) {
Connection con = null;
Statement statement = null;
try {
String searchKeyWord = "Smith";
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sampledatabase", "root", "123456");
statement = (Statement) con.createStatement();
String sqlQuery;
sqlQuery = "select *from demo19 where name like '%" + searchKeyWord + "%'";
ResultSet rs = statement.executeQuery(sqlQuery);
while (rs.next()) {
System.out.println(rs.getString("name"));
}
} catch (Exception e) {
e.printStackTrace();
}
}
}This will produce the following output −
John Smith Adam Smith
Following is the snapshot of sample output.
Updated on: 19-Nov-2020
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